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//-----------------------------------------------------------------------
// <copyright file="IDirectedIdentityIdentifierProvider.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OpenId.Provider {
using System;
using System.Diagnostics.Contracts;
using Validation;
/// <summary>
/// An interface to provide custom identifiers for users logging into specific relying parties.
/// </summary>
/// <remarks>
/// This interface would allow, for example, the Provider to offer PPIDs to their users,
/// allowing the users to log into RPs without leaving any clue as to their true identity,
/// and preventing multiple RPs from colluding to track user activity across realms.
/// </remarks>
public interface IDirectedIdentityIdentifierProvider {
/// <summary>
/// Gets the Identifier to use for the Claimed Identifier and Local Identifier of
/// an outgoing positive assertion.
/// </summary>
/// <param name="localIdentifier">The OP local identifier for the authenticating user.</param>
/// <param name="relyingPartyRealm">The realm of the relying party receiving the assertion.</param>
/// <returns>
/// A valid, discoverable OpenID Identifier that should be used as the value for the
/// openid.claimed_id and openid.local_id parameters. Must not be null.
/// </returns>
Uri GetIdentifier(Identifier localIdentifier, Realm relyingPartyRealm);
/// <summary>
/// Determines whether a given identifier is the primary (non-PPID) local identifier for some user.
/// </summary>
/// <param name="identifier">The identifier in question.</param>
/// <returns>
/// <c>true</c> if the given identifier is the valid, unique identifier for some uesr (and NOT a PPID); otherwise, <c>false</c>.
/// </returns>
[Pure]
bool IsUserLocalIdentifier(Identifier identifier);
}
}
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